[AMRadio] Johnson 500 Schematic

[Craig Heaton]

Dave,

Two things: One, I don't think there was an early Junkston "500" which used
a 4-250A. Their production years were 1957-1962? (going from memory here).
By 1957 Johnson had switched to 4-400A's in the Desk KW. Sort of apples to
oranges. 

Like you I'd have to see a 500 schematic showing a 4-250A.

Two: When a "500" followed me home and upon inspecting the entire rig wire
by wire, part by part; the keyer circuit was not as per the BAMA schematic.
I then restored the 500 as per the BAMA schematic, keyer works!

Best Regards,
WD8KDG
Craig
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-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Dave Harmon
Sent: Tuesday, March 19, 2013 7:33 PM
To: 'am'
Subject: [AMRadio] Johnson 500 Schematic
Importance: High

Recently I acquired a Junkston 500 and it works great....except the keyer is
not adjustable.
The rig can be keyed ok but the adjustment pot has no effect.
Yes...the pot is good.
The keyer does not conform to the schematic I have.
Apparently I have an early model but a later schematic.
Can anyone help me out with the early schametic?
All I need is a .jpg of the keyer area......or a location to dwnld the early
schematic.
I think the early schematic will show a 4-250....

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.



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